MathsYears 12–13Coordinate Geometry
Circles
Derive and use the equation of a circle; find tangent and normal lines; intersections with lines
What you'll learn
- 1
A circle is all the points that are the same distance from a fixed point — the centre. 🎯
- 2
What do we call the fixed point in the middle of a circle?
- 3
Here's a circle with its key parts labelled.
- 4
A circle has a radius of 5 cm. Find the diameter.
- 5
Drag the pointer to show a radius of 4 cm on this circle.
- 6
If the radius is 7 cm, what is the diameter?
- 7
Which line goes from one side of a circle to the other, passing through the centre?
Practise Circles with Whizlo
Free AI-tutored lessons, unlimited practice questions, and progress tracking for ages 16–18. Aligned to the UK National Curriculum.